http://www.roblox.com/BP-PZ8-Pulverizer-item?id=42899445
That's a gun a friend of mine built. I'm aware that it uses brickmeshes in the bricks to build the gun (Not the scripts, the actual thing you hold) but not where I could find these meshes. I've been wanting to get into making things like this, but I've been unable to find the meshes. Could anybody direct me to a good source of brickmeshes?
Click on a brick with select tool. Go up to Insert>Brickmesh. Then go into workspace, find the brick, click + beside it, then click on the mesh. Then change the (1,1,1) to smaller numbers to make it smaller. Such as 0.1.
You can also find a mesh that looks just like a brick then, do what Alanze said above. This will make it look like your using bricks that are mush smaller then real bricks.
You can also find a script called mini-map maker. This script takes your place and shrinks it to a very small scale. If you want to build a gun like that make a huge version of the gun to make it easier to focus on detail then shrink. I use it all the time. It's a great way to make guns